Whar factors influence osmosis? Your answer should include a discussion on semi-

Question

Whar factors influence osmosis? Your answer should include a discussion on semi-selective membranes, solute permeability and concentration gradients with respect to osmosis What is osmotic pressure? Whar is meant by dissociation? How can two solutions have the same molality, yet one solution be higher in osmolality compared to another? What are the body fluid compartments that are separated from their surroundings by some sort of barrier? Give the percentages that each one contributes to total water in the body. > What is an aqueous solution? What is a solvent? What is a solute? Does the type of solute (composition) affect water movement? Why? Does the solute concentration difference across the membrane affect the tendency for water to flow across the membrane? Why? Why was it important to tare your weight when your membrane bag was in the cup? Why did you have to weigh the bags before and after the experiment? Explain the weight gain or loss for each cell for which a gain or loss was observed > When are soluations considered to be hyperosmotic? What would happen to a cell if placed in a hyperosmotic solution? 61

Explanation / Answer

1. Osmotic pressure is the pressure exerted on a semipermeable membrane due to movement of solvent. Higer will pressure gradient highrr will pressure. Semipermeable membrane allows some molecule to pass increasing the conc. Gradient and also pressure.

2. It is a pressure exerted so that pure solvent can't enter the solution through semipermeable membrane.

3. Dissociation is splitting of compound into its components. Osmoles are total components after dissociation into water and osmolarity is the multiplication of no. Of osnole into molarity of a solution. Hence two are different.

4. There are two main fluid compartments extracellular and intracellular fluids. Fluids are total 60% of body weight and out of which 62-63% is extracellular and 37-38% is intracellular fluid.

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